Flag error handling: "The response object is not iterable"

Question

I am trying to install a REST web service using Flask. I had a problem with error handling @app.errorhandler(404)

 #!flask/bin/python from flask import Flask, jsonify, abort app = Flask(__name__) @app.errorhandler(404) def not_found(error): return jsonify({'error':'not found'}), 404 if __name__ == '__main__': app.run(debug = True) 

When I do this, I get nothing. In my debugger, this tells me that I have a TypeError: 'Response' object is not iterable

I used jsonify in another method with a dictionary without problems, but when I return it as an error, it does not work. Any ideas?

Answer 1

 from flask import Flask, jsonify app = Flask(__name__) @app.errorhandler(404) def not_found(error): return jsonify({'error':'not found'}), 404 app.run() 

With the curl http://localhost:5000/ code above, curl http://localhost:5000/ give me:

 { "error": "not found" } 

Are you flask.jsonify ?

Answer 2

As mentioned in the comments to the previous answer, this code is not supported on Flask 0.8 and requires 0.9 or higher. If you need to support Flask 0.8, here is a compatible version that assigns "status_code" instead:

 @app.errorhandler(404) def not_found(error): resp = jsonify({'error':'not found'}) resp.status_code = 404 return resp